Correct option is (b) Diphenhydramine
The explanation: Ethylenediamine consists of mepyramine. Diphenhydramine is of ethanolamine has significant anticholinergic side effects and sedation. Chlorphenamine is of alkylamine class. Cyclizine is of piperazines class, structurally related to the ethylenediamines and the ethanolamines used most often to treat motion sickness, vertigo, nausea, and vomiting.